public class FrequencyCounter{
    private final ConcurrentHashMap<Integer,Long> frequencenyMap = new ConcurrentHashMap<>();

    public void processRequest(Request request){
        frequencenyMap.merge(request.type, 0L, (v, d) -> v+1);
    }

    public void clearMap(){
        frequencenyMap.clear();
    }

    public Map<Integer,Long> getMap(){
        return ImmutableMap.copyOf(frequencenyMap);
    }
}